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CVE-2026-64540

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.1 · Élevée
EPSS 0.3%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <2.6.14, 0, <=7.1.*, 6.1.178, <573418f7ea8f859a841417eb4b915594094fd967, <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db, <=5.10.*, <=6.6.*, 6.12.97, 2.6.14, <4359376e6238d89977a35086e47ca3b07f43e850, <8624e179fa3ce23c2fbd1a198ce30764b73f054a, 47ee3051c856cc2aa95d35d577a8cb37279d540f, <3ef79fa3860e644c8de7834fa7300e1c58f38862, <255d03551f94c7bdd86c7d9181a70b21917d829f, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, <=*, <0575599e451aff3c5329922562374a2cab25fc51, <=5.15.*, 7.2, <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a

Description

In the Linux kernel, the following vulnerability has been resolved: usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup() genelink_rx_fixup() splits an aggregated RX frame into its individual packets, using a per-packet length taken from device-supplied data. That length is only bounded by GL_MAX_PACKET_LEN (1514); it is never compared against how many bytes were actually received. A malicious GeneLink (GL620A) device can therefore send a short URB whose header claims packet_count > 1 and a first packet of up to 1514 bytes. skb_put_data(gl_skb, packet->packet_data, size); then copies past the end of the receive buffer and hands the adjacent slab contents up the network stack, an out-of-bounds read that leaks kernel heap. No privilege is required: the path runs in the usbnet RX softirq as soon as the interface is up. BUG: KASAN: slab-out-of-bounds in genelink_rx_fixup (drivers/net/usb/gl620a.c:112) Read of size 1514 at addr ffff888011309708 by task ksoftirqd/0/14 Call Trace: ... __asan_memcpy (mm/kasan/shadow.c:105) genelink_rx_fixup (include/linux/skbuff.h:2814 drivers/net/usb/gl620a.c:112) usbnet_bh (drivers/net/usb/usbnet.c:572 drivers/net/usb/usbnet.c:1589) process_one_work (kernel/workqueue.c:3322) bh_worker (kernel/workqueue.c:3405) tasklet_action (kernel/softirq.c:965) handle_softirqs (kernel/softirq.c:622) run_ksoftirqd (kernel/softirq.c:1076) ... skb_pull() already verifies that the requested length fits the buffer and returns NULL otherwise. Move it ahead of the copy and check its result, so a packet that overruns the received data is rejected before it is read. Well-formed frames, whose packets are fully present, are unaffected.

Gravité et risque d'exploitation

CVE-2026-64540 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 18.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <2.6.14, 0, <=7.1.*, 6.1.178, <573418f7ea8f859a841417eb4b915594094fd967, <0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db, <=5.10.*, <=6.6.*, 6.12.97, 2.6.14, <4359376e6238d89977a35086e47ca3b07f43e850, <8624e179fa3ce23c2fbd1a198ce30764b73f054a, 47ee3051c856cc2aa95d35d577a8cb37279d540f, <3ef79fa3860e644c8de7834fa7300e1c58f38862, <255d03551f94c7bdd86c7d9181a70b21917d829f, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, <=*, <0575599e451aff3c5329922562374a2cab25fc51, <=5.15.*, 7.2, <8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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